Medical equipment. Drainage needles are used for trauma drainage or postoperative drainage. They are puncture and drainage needles that can puncture and drain subcutaneous or intracavity fluid. They are also medical instruments that must be used in various drainage surgeries. They are medical instruments. The drainage needle consists of a three-way needle tube, a needle drill, and a non-hole cap. The main raw materials are polypropylene and stainless steel. It is a special tool for puncture and drainage of acute, subacute and chronic intracranial hematomas.